One-pot synthesis of TiO2/graphene nanocomposites for excellent visible light photocatalysis based on chemical exfoliation method

We demonstrate a novel technique to synthesize TiO2/graphene nanocomposites without the use of graphene oxide

Nhan Nu Thanh Ton; Anh Thi Ngoc Dao; Koichiro Kato; Takuma Ikenaga; Dai Xuan Trinh; Toshiaki Taniike

2018

Scholarcy highlights

  • Facile electron-hole recombination and the broad band gap are two major bottlenecks of titanium dioxide applied in visible-light photocatalysis
  • We demonstrate a novel technique to synthesize TiO2/graphene nanocomposites without the use of graphene oxide
  • Graphene dispersion was obtained through the chemical exfoliation of graphite in titanium tetra-n-butoxide by ultrasonication
  • The dispersion was directly used for the sol-gel reaction in the presence of different catalysts, affording TiO2/graphene nanocomposites featured with several advantages: i) the formation of a TiO2 nano layer that uniformly and thinly covered graphene sheets, ii) a trace amount of defects on graphene sheets, iii) a significant extension of the absorption edge into the visible light region, and iv) a dramatic suppression of electron-hole recombination
  • When tested for methylene blue decomposition under visible light, our nanocomposites exhibited the photocatalytic activity 15 and 5 times greater than that of TiO2-P25 and a conventional GO-based nanocomposite, respectively

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